Cutter chain



L. E. SIMMONS CUTTER CHAIN Original Filed June 27, 1953 Im v Hmmm' v Patented Jan. 9, 1940 uNirso vs'i'it'ras PATNT QFHCE i oU'r'rER CHAIN Leon E. Simmons, Claremont, N. H assignor to -SullivannMachineryiGompany, a corporation of Massachusetts vApplicaomn .time 27, 1988, sriai Na. 677,880

Renewed March'13, 1939 This invention relates to cutter chains, and

more particularly to improvements in` cutter bit in place on the bit block. Still another object is to provide an improved. cutter bit. Yet another object is to provide an improved cutter bit and cutterbit holding means and means associated with thel bit and holding means for holding the cutter bit in position therein. These w and other objects of the inventionwill, how e'ver, hereinafter morenfully appear.

In the accompanying drawing there is shown for purposes of illustration oneform which the invention may assume inpracticel In this drawingn Fig. 1 is a side elevational view of the illustrative embodiment of the improved cutter chain.

Fig. `2 is a cross sectional view taken substantially on line 2-2 of Fig. '1.

Fig. 3 is a llongitudinal sectional'viewtaken substantially on line 3-;3 of Fig. 2. Fig. 4 isla perspective view of the bit holder, with the bit looking pin removed. f

Fig. 5 is a perspective view of the ;cutt'er bit; In this illustrative enibodiment of theinvention the improved cutter bit and bit holding meansare shown' associated with a cutter chain of a standard commercial design icvompris'i'ng a bit block i pivotall' connected at 2 to side' straps 3. The bit block `is traversed by a socket 4 for receiving the shank 5 of the improved bit holder. 'rhreaded 'within thebit block is a set Screw 8 for engaging the bit holder shank nfor'securing the bit holder Within the bit block socket.f` It will be evident,v however, that the improved bit and bit holding means may be used. with or without minormodification. in' cutter chains of various other types; and it istherefore not desir'ed to limit lthe invention to the particular typeof cutter chain shown. i' 7 Now referring to the improved bit'and bit'holding means, it will be noted that formed integral with the bit holder shank 5 is a generally cylindric body 'i having an opening 8 of circular cross section herein forming a socket for receiving the cylindrical body S2 of the'improved cutter bit. The bit socket 8 is herein formed at an ang'le With respect to aV line parallel with the' outer ments M; Ill also engage the surface IO. Thus, asfurther'inward movement of the holder 5. is m;

surface Ill of the bit block and is inclined upwardly and forwardly in the manner shown. The

bit holder body 1 is provided with lateral planeV surfaces li,'.i| terminating at shouldersl la; HH. The cylindric body'Tof the' bitlholder is transversely slotted at |2', and slidably' arranged within th'` slot forflmovement in'a direction trans- 5 verseto its length is'a holding'pin |3secured at its ends within-support elements [4,14 each having an inner plane 'surface |5 slidably'engag'ing "a'surface and also having aV lower plane surface 15a adapted to'rest'on the'surface 10 IG of the bit block, in'the manner shown in Fig. 2, when a bit is being held' in the holder.

The' cutter bit per se is in the form'of a cylindrical rod'section having beveled end surfaces' IB 'and'lllforming Cutting points .18 at the opposite ends rof the cylindrical bit body. The 'bit may vbe 'formed from various symmetrically shaped' bar stock, and it 'is' not desired'to' limit the invention to the 'particular shape' shown. The cutter bit has ``its points '18, |8at its oppov site ends, and at its extremities has elongated facesi'wh'ch'are identical in outline, which'lie in planeforming a dihedral angle, andwhich ar'e individuallyjsymmetrical as to both'major' and minor axial lines. The cylindrical bit 'body is; at |9,' transversely slotted', -preferably with a V-'shaped notch, `in` its side diametrically oppo- .site'the'poin'ts i8,'and miclway betweenitsends, forreceivingthe holding pin, 13 when the-parts are in'the' position shown in Fig. 3, to lock the bit against' axial vdisp'lacement Within the bit holderisock'e't'f. `When the parts 'are in the position shown in Pig. 3, the beveled end surface w i' offthebitnrestsv on' 'the surface' Ill' of `the bit block, while the'opposite surface I'll extends upwardly and forwardly and is the then active; Cutting' surface. 'The surface IG'then takes the pressure'f'rom the' cutting vWhile 'the pin 13 pre-l vents withdrawal or' chattering of the bit. When the active cutting point v|8 of the cutter bit be- 40 comes dull, the parts may be loosened within the bit block' socket, and the bit h'older'may be moved outwardly to permitithe pin' |3 to m`ove'out of. the slot l9 in the bitv body, 'therebyi permitting withdrawal ofthe` bit axia'lly'froni the bit'holder socket Thebit may'then be turned end for end within the bit holder socket, so that the beveled surface i'l will engage the surface lOiof the bit block and l'the'surface liextend upwardly andy forwardly and'becomel the then'active Cutting 50,".V

surface; The 'bit `holder shank ^is insertediinwardly until the surface '|1' engages the surface ifl, and the' surfaces Ia of the supporting. eleeffected the bit will be moved forwardly in the bore 8 and the pin |3 upwardly into the notch |9, and when the pin |3 prevents further forward movement of the bit and the wall of the notch prevents further outward movement of the pin l3 the screw 6 is tightened and the bit is tightly held.

As a result of this invention, it will be' noted that an improved cutter chain is provided having a cutter bit of improved design and an improved holding means engageable with the bit forV holding the bit in place within the bit block socket. It will further be noted that theimproved cutter bit is provided with oppositely disposed cutting points and may be inserted in either direction within the bit holder socket and held therein by the improved holding means engaging the bit intermediate its ends. It will still further be noted that the improved cutter bit and. bit lholding means may be used With a cutter chain of a standard design and may be readily and cheaply manufactured, the cutter bit holder being of an extremely simple and inexpensive design. These and other uses and advantages of the improved cutter chain will be clearly apparent to those skilled in the art.

My invention in this application is subordinate to the inventions of Morris P. Holmes, disclosed and claimed in his applications for improvements in Cutter Chains, vSerial Nos. 649,003 and 658,804, filed respectively on Dec. 27, 1932 and Feb. 27, 1933; and I do not claim, and indeed expressly disclaim, any invention common to the disclosures of either or both of said Holmes applications and this present application. I

While there is in this application specifically described one form which the invention may assume in practice, it will be understood-ithat this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms Without departing from its spirit or the scope'of the appended claims.

` I claim:

1. In a cutter chain, in combination, a bit block, a. deta'chable cutter bit holder carried by said bitrblock and having a forwardly and outwardly inclined opening for receiving a cutter bit, a cutter bit receivable in said holder' opening and having a forwardly facing abutment surface thereon, adjustable means mounted on said holder and guided on said holder for relative' movement bodily with respect thereto', said meansengaging la surface on said bit block and said for- Wardly facing abutment surface for securing the cutter bit against forward axial release from said holder opening and said holder having guiding vmeans thereon for said adjustable means, within which the latter is movable longitudinally of said holder and which guiding means on the holder coact with the forwardly facing surface of said adjustable means to preclude `displacement of' said adjustable means forwardly With respect to the holder whereby the adjustable means holcls the bit against forward movement in said opening and releasable means for securing said holder on said bit block. 2. In a cutter chain, in combination, a bit block, a detachable cutter bit holder carried by a forwardly facing abutment surface thereon,

the rearward end of said bit projecting outwardly from said holder opening into engagement with an outer' surface on said bit block, adjustable means mounted on said holder and guided on said holder for relative bodily movement with respect thereto, said adjustable means confined, entirely by the guidance afiorded by said holder, against bodily movement forwardly with respect to said holder and said adjustable means engaging a surface on said bit block and said forwardly facing abutment surface for securing said cutter bit against forward axial release from said holder opening with said rear end of said bit in firm engagement With said bit block surface, and releasable means for securing said holder on said bit block.

3. In a cutter chain, in combination, a bit block having a socket, a detachable cutter bit holder having an elo'ngated shank portion receivable in` said bit block socket and having a for- Wardly and outwardly inclined opening extending completely therethrough for receiving a cutterV bit from either end thereof, a cutter bit insertble within said holder opening from either end of said opening and having a forwardly facing abutment surface thereon, means fo-r securing said cutter bit within said holder opening with the rear end of said bit engaging a surface on said bit block and for looking said bit against forward axial release from said holder opening comprising adjustable means mounted on said holder and guided on said holder for relative bodily movement longitudinally of the holder but confined, entirely by the guidance afforded` by said holder, against bodily movement forwardly with respect to said holder, said adjustable means engaging said forwardly facing abutment surface, insertive movement of said holder shank portion within said bit block socket effecting clamping of the rear end of said cutter bit against the outer surface of the bit block upon engagement of said adjustable means with said forwardly facing abutment surfacaand releasable means for securing said holder shank portion within said bit block socket.

4. A cutter chain block having a bit holder supporting head, a bit holder removably engaged With said chain block head, said bit holder carrying a bit in an inclined position therein for abuttinglyi engaging one end of said bit against said chain block head, and a bit holding element carried and guided by and movable bodily relative to and longitudinally of said bit holder and engageable with the bit exclusively at a part of the latter which is substantially midway between the ends thereof for holding the bit in said holder.

5. In a cutter bit and link, in combination, a cutter bit having a body formedwith a pair of opposite end surfaces forming cutting surfaces at its opposite ends, means for holding said bit against movement in a direction opposite to the direction of travel during cutting including a surface parallel to the direction of travel of the bit during cutting engaged by the inactive cutting surface and another surface at an acute angle to the first mentioned surface and engaged by the back of the bit, and a holding element bodily adjustable relative to said fourth surface and engaging said bit only at an intermediate portion of the bit body spaced from both of said end surfaces and from the back of the bit for preventing forward withdrawal of the bit.

6. A cutter bit holding means having a socket, the outer wall of the socketbeing inclined forwardly and outwardly, a double ended bit having oppositely inclined end surfaces forming cutting faces and a body receivable in said socket and ,openingextending,therethrough and a guideway providing a forwardly facing holdingabutment surface substantially to the rear of the rearmost portion of the forward end surface of said bit, said bit having a surface engageable with the inclined o outer surface of the socket and the inner inactive cutting faceof the bit engaging a surface on the holding means along a line parallel with the path of movement of the bit and holding means during cutting, and a holding device adjustable relative to said bit receiving socket and engageable with said forwardly facing abutment surface which is with the inactive plane cutting surface of the bit engagin'g the outer surface of the bit block, and adjustable means carried by said holder and mounted thereon for guided movement relative thereto, said adjustable vmeans engaging said vbitV only at an intermediate portion of the latter spaced from both of its Cutting faces and located substantially midway between the ends of the bit forlocking the bit in the bit holder socket.

8. In combination, a bit block having a socket i for receiving a bit holder, a bit holder receivable within said socket 'and having an obliquely disposed bit-receiving opening therein, a cutter bit receivable in said opening and projecting forwardly therefrom, and means for securing said bit in position against forward escape including a pin carried 'by said bit holder and guided Wholly by said holder for reciprocation longitu dinally of said holder relative to the latter and engageablewith said bit when said holder is inserted in the bit block socket.

9. In a cutter chain, in combination, a bit block I having a socket, a detachable cutter bit holder having head and shank portions, said shank portion vreceivable in said bit block socket and said head portion having a bit-receiving opening extending therethrough and a guideway e'xtending longitudinally of said shank portion, a cutter bit receivable in said head portion opening and lhaving a transverse notch between its ends, means mounted on said holder forl looking said bit against endwise release from said opening including a` transverse abutment member reciprocably guided in said head portion guideway and engageable with said notch, and releasable means for securing said holder shank portion within said bit block socket.

10. In a cutter' chain', in combination, a bit block having a socket, a detachable cutter bit holder having head 'and shank portions, said shank portion receivable in said bit block socket and saidhead portion having a bit-receivingv extendin'g longitudinally of said shank portion, a

means mounted on said holder for looking said bit against endwise releasjefrom said opening includguided in said head portion guideway and engageablewith said notch, and elements arranged 1.0

which said abutment memberis secured, said ele- 7 at the oppc'sitesides'of said head portion and to member, and said elementsby engagement withH ing a transverse abutment member reciprocably the outer block surface maintaining said abutcarried by said bit block and having a forwardly and outwardly vinclined opening for receiving a cutter bit, a cutter bit receivable in said holder opening and having a forwardly facingv abutment surface thereon, adjustable means mounted on said holder and guided on said holder for relative.

movement bodily longitudinally of said holder, said holder having longitudinally extending guidcluding movement of the latterforwardly with respect to the holder, said adjustable means resting against an outer surface of saidbit' block and engaging said forwardly facing abutment surface ofl saidv bit'for securing said bit against forward axialrelease from lsaid holder opening, and re- Vleasablemeans for securing said holder on said bit block.

- ing means thereon for said adjustablemeans prei 12, In a cutter chain, thel combination comprising a bit block having 'a socket, adetachable cutter bit holder receivable in said'v block socket and having an opening 'extending completely therethrough for receiving a' cutter bit, a cutter bit receivable in said holder opening with its rear end engaging an outer surface of saidbit block, said cutter bit having a forwardly faoing abut- `ment surface, adiustable means vmounted on said holder and guided on said holder for bodily rela -tive movement longitudinally with respect to said holder and confined, entirely by the guidance afforded by said holder, against bodilyhmovement forwardly With respect to said holder, said 'adjusting means resting on an outer surface of said of said bit block, and releasable means yfor securing said holder in said bit'block socket.

. LEON E. SIMMONS. 

